The APOE gene encodes the amino acid sequence of the apolipoprotein E protein, which plays an important role in lipid metabolism. In people with the E2 allele, the conversion of intermediate-density proteins into low-density proteins is impaired due to the ineffective binding of ApoE2 to corresponding receptors. Carriers of at least one of E4 alleles who lead a sedentary lifestyle tend to have increased both total cholesterol, low-density lipoprotein cholesterol (“bad” cholesterol) and triglyceride levels. High-intensity training can normalize a blood lipid profile and increase “good” cholesterol levels. Atherosclerosis is more likely to develop in people with the E2/E2 phenotype, as well as those with at least one E4 allele. Where two E4 copies are present, the risk is higher than in the case of one E4 copy (the risk of cardiovascular diseases’ development is three times higher).